{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Moreover , the comparison of the new structure with 15 previously solved structures of P450 2B4 revealed some new insights into determinants of active site size and shape ."}
{"Chemical": []}